i noticed that the japanese and south korean reporters announced iranian observers were on hand for the launch. >> we've known for a number of years that iran and north korea have worked together to some extent on this beginning with north korean sales of short-range missiles to iran that iran seemed to use to start to build up their own program. and the third stage of this launcher looks very similar to the upper stage of the iranian launcher so that's pretty direct evidence that that there has been some level of discussion, collaboration between them but we really don't have a good sense of how deep that goes. >> warner: han park, there is talk among some countries-- the u.s., britain, and france-- about the possibility of increased sanctions. it's an open question as to whether that will happen. do you think anything can dissuade north korea, one of the most sanctioned countries in the world, from continuing down this path realistically? >> i think it's the wrong path. any kind of sanction will not work. if, in fact, economic sanction especially were to force north korea to give in,